ptygman.

Brit.

/ˈtɪɡmə/, U.S.

/ˈtɪɡmə/

Inflections: Plural ptygmas, unchanged.

Origin: A borrowing from Greek. Etymon: Greek πτύγμα.

Etymology: < ancient Greek πτύγμα fold, anything folded ( < the stem of πτύσσειν to fold (see ptyxis n.) + -μα (see -oma comb. form)), after ptygmatic adj.

Geology.

A ptygmatic fold.

ΘΚΠ

the world > the earth > structure of the earth > structural features > fold or dip > [noun] > others

isocline1890

synform1937

ptygma1944

1944 Trans. Royal Soc. Edinb. 61 228 The foliation (gneissic structure) of the host rock appears to conform to the plications of the ‘ptygma’.

1960 Rep. 21st Internat. Geol. Congr. XIV. 138 It is concluded that ptygmas could have been formed as the result of development in a passive host or possibly, though improbably, as the result of magmatic flowage.

2002 Precambrian Res. 117 46/2 These granite leucosomes occur as ptygma in domains of relatively weak deformation.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	ptygma
释义	ptygman. Brit. /ˈtɪɡmə/, U.S. /ˈtɪɡmə/ Inflections: Plural ptygmas, unchanged. Origin: A borrowing from Greek. Etymon: Greek πτύγμα. Etymology: < ancient Greek πτύγμα fold, anything folded ( < the stem of πτύσσειν to fold (see ptyxis n.) + -μα (see -oma comb. form)), after ptygmatic adj. Geology. A ptygmatic fold. ΘΚΠ the world > the earth > structure of the earth > structural features > fold or dip > [noun] > others isocline1890 synform1937 ptygma1944 1944 Trans. Royal Soc. Edinb. 61 228 The foliation (gneissic structure) of the host rock appears to conform to the plications of the ‘ptygma’. 1960 Rep. 21st Internat. Geol. Congr. XIV. 138 It is concluded that ptygmas could have been formed as the result of development in a passive host or possibly, though improbably, as the result of magmatic flowage. 2002 Precambrian Res. 117 46/2 These granite leucosomes occur as ptygma in domains of relatively weak deformation. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1944
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